'use strict';

function choose_no_common_elements(collection_a, collection_b) {
  let result=new Array();
  for(let i=0;i<collection_a.length;i++){
    if(collection_b.indexOf(collection_a[i])==-1){
      result.push(collection_a[i]); 
    }
  }
  return result;
}

module.exports = choose_no_common_elements;
